Biscuit shaped nano tungsten disulfide can be prepared by calcining tungsten powder, sulfur powder and K₂HPO₄ salt at the temperature of 500°C. This method is simple, low-cost and suitable for mass production.

Tungsten disulfide is added to lithium base grease to form a new kind of grease that has good colloid performance and friction performance. It is an ideal lubricating material, which can effectively reduce the friction loss.

A new kind of grease with good lubricating performance is formed by adding tungsten disulfide to lithium base grease, which is a simple and time-saving preparation method.

Supercritical carbon dioxide solvent is used to assist the extraction of tungsten disulfide and obtain less layers or single layer of tungsten disulfide. The extraction process is safe and free of pollution, which provides a reference for the preparation of other layered materials.